A history of mystery (Image: Dale O’Dell/Rex Features)
THE Trojan horse of legend held in its belly the men and means to help sack ancient Troy. Now it appears another type of Trojan could endanger every life on Earth. So says a study of the Trojan asteroids that exist around the orbit of Neptune: material from these may go on to become comets that could strike our planet.
Around three-quarters of the impact risk to Earth comes from near-Earth asteroids, about 1000 of which are being tracked by sky surveys. The rest of the risk comes from comets, which have…
